The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 2006
Filed:
May. 30, 2002
Keiichi Ito, Osaka, JP;
Atsuhisa Kageyama, Ibaraki, JP;
Keiichi Ito, Osaka, JP;
Atsuhisa Kageyama, Ibaraki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention provides a gradation correction device which can perform gradation correction using digital feedback processing, and furthermore, can control the digital feedback processing with high accuracy. The gradation correction device is provided with a correction gain adjustable amount generation circuit () and a correction gain generation circuit (), and the correction gain adjustable amount generation circuit () obtains a correction gain adjustable amount which is non-linear in relation to a difference S between a reference luminance level Yband a maximum luminance level, and greater gamma correction is carried out as the value of the difference is larger.